Incorrect. Use FOIL and simplify. Remember that $\displaystyle{{i}}^{{2}}=-{1}\usepackage{cmbright}\Huge\$ .

$\displaystyle{\left({6}+{i}\right)}{\left(-{8}+{i}\right)}={6}{\left(-{8}\right)}+{6}{\left({i}\right)}+{i}{\left(-{8}\right)}+{i}{\left({i}\right)}\usepackage{cmbright}\Huge\$